5. Few people understand that the _________ (exist) of rare animals is closely related to our life. 作从句的主语

　　fundamental

　　existence 作定语用形容词 1. ____________下蛋 2. ____________挡住(光钱) 3. ____________感到高兴; 感到振奋 4. ____________突发; 爆发 三、短语翻译 break out

　　lay eggs block out cheer up 5. ________________密切注视; 当心; 提防

　　6. ________________阻止; 制止

　　7. ______________产生; 分娩

　　8. ______________及时 in time

　　watch out (for)

　　prevent ...from give birth to 9. ______________ 轮到某人；接着

　　10. ______________既然

　　11. ______________依靠

　　12. ______________结果 as a result in one’s turn now that depend on 四、课文回顾

　　No one knows exactly how the earth began. However, according to a widely accepted theory, it began 1______ a “Big Bang”. Then the earth exploded loudly and produced water vapor and many gases, 2_______ (make) the earth’s atmosphere. And then as the earth cooled down, water appeared and stayed 3___ the surface.

　　with

　　making

　　on

　　It was the presence of water 4____ allowed the earth to dissolve harmful gases and acids into the oceans and seas, 5 ______ made it possible for life to develop. And the 6____________ (appear) of small plants encouraged the development of early shellfish and all sorts of fish. Next, green plants began to grow on land. 7_____ were followed by land animals. Later, reptiles appeared for the first time, after which dinosaurs developed.

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